took my SLR/c out for a stroll, mounted with OM 35-80/2.8. Not so easy to use. I got a lot of overexposed photos with alternative glass. How do you do long exposure with this cam? I stopped down to f22 and stick a ND4 in front but even at 2sec, the photo is overexposed. Anything beyond 3sec, the camera will not allow me to take, stating the exposure time is too long. Do I need to change the aperture dial on the camera to reflect f22 as well?